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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '568b2a0522ac61be9e2b454f4c5dffd0e2754e2f6ac6931c8c7e3e57d1c2f697' 
  AND token = 'FhqFj7Jev4txafBWeXgnLb20yEzNwd1vPyUJLTW44pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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