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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '467c7c13e4b86c2723d90731fd9d413a6b261153549812cde80579338dfddfb2' 
  AND token = '74LQ7HN3aMHO8Q8AwL8xS18PmJ5lV2SR6Vj4g9oBWIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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