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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a8fdc9fd9846b8b86373816f8b06d6e54e47e4577ec4210aa6f44652b9eaee0' 
  AND token = 'Wz2HMQLbHOF0CKhjzMps2fLNeqgbREJO8i8pBLSfjUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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