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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '421c8d6d56ce2d1760698fa7f9949146f8a2968a13f9c5fc083d046c96936a69' 
  AND token = '3BaTT/21QgjNb7y+AE8J5YOue19TyeqXJIqAQPnK2Ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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