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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4713c243dc3d9c27ce1873ea735d03d95efc274f6ff196bb5af8e23bf61c7f4d' 
  AND token = '9Dky01UMcYV5W6iqI5lV7hYTxwWk0m20++LgHMADF08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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