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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec55faa409e5063df8e309e14fa9cd8317ff0a24cde8426e0dc08a53ea3a56bd' 
  AND token = 'RdaUW9iytvxXhrYypD1TWZp3AfUvRFJ8ZYqA4V/cwZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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