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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e84e9d55ccb03f84e3b3c4a98c2c63ac010385ee24b2ce3e480900d3098dcf7' 
  AND token = 'XTqv/152t1fOBI/L9c2dsTEHnAcnBVOhUWXl3ERTREw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}