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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '851cdc1b6186d1873487257282e7623f4f494818b0b5e2cda7296964148d86dd' 
  AND token = 'eOpRfq+Do2JnVFtL7AxrXTVQv06wNV6TTIlCLP1EEW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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