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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f94a804b2fd9f572911e733f4b061419599faeb440426d646d8bb973c5ce0316' 
  AND token = 'MZpooyeBDc5Gy9Sjh5zChutCb6touFFNgRv9PyfMyuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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