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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e58e8df916a5edaa4f88cd928a74a768f724ef0934308aee5ead07cb6a8fbe2' 
  AND token = 'CUi7JGYqT56XuQUq+9jm3oNp6En7b43L9KrmtOIRW54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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