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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75d8743ce207e2aac2c18f8e1e0c627bc9ec6dde0e85c9090326639abbe6db8f' 
  AND token = 'Rqf98HBRzquLjHV0HxgI8Ho3r9C7GSY9nBobQaxUshM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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