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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91b80dc71189c9b5cd98d294563503b6cd3b602fbadd54527b6201ea96aced2d' 
  AND token = 'OlFZvIJhEi8Q0f3YqR+4OzFxjrK54CO6nX4mdgec88Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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