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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9eebb98f719d8a38422ab5a766b37dc8ea71ef42e2db585353437d72d552485' 
  AND token = 'odFBPF/J8C4bkW1jQ3ANkVQGvi8ky4UfSymkduaUgbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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