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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2388da3633002ed85b517c8eff455104fc5963b3c1ee6364f68e2e0040183ebc' 
  AND token = 'AsBaI8fReDdb0pCFdxUnCVdCIx6K1cmh/qVgR2vvzU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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