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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f86dda2910005fb051864c7ff7f31341882070944b1655c80abafe8ef91018ae' 
  AND token = 'tPVmhczpRbx8NOCaJm8fOG8xrTVDBKi1TAjtxltCywY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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