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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd2c6c6f0b5ce965364d7116de305f67f50f7b644dab02e08e6074546e5e241e' 
  AND token = 'n+aCeKYhalKb7s0ZbDmcF+isT/oLhltYvXQoKTn/woo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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