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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6674d1e551b199a95007cfe5cc2779a6c9c1e700aa01536b08d88bb4927738e' 
  AND token = 'OVfTMljZ4O67PVFzgMe7ETbv1kueoIh5GL9fFQipu14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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