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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bf6b929a65dfbcd08cd3f0df7ca7ac22d83b3c99b7cbb31d66b37ce94d9ef7a' 
  AND token = 'f+IbnIHVT6tzjPtZUD8llON4u1KrvEODsVUVoLxTS6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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