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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbc060ae3dca6419530c25a3a604c9f6174bd2446623894c69a6ebf1ea301384' 
  AND token = 'yQP1uD+9xilZWHm+iEbv3EyRvimJmXbmJ8XgqvWMQeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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