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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ff2b520b21c53a7b1aedfc4d044ebf65e827b2404d08e1b29edd7843d18708d' 
  AND token = 'S1HF4RzrVP8mGPeUubD4yW823klikyadTz8M+Y8EsT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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