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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb06036ac0d0a040b282be81c4e4d29f8ca7d79b3f765445ac9c96c2ff1fd505' 
  AND token = '8zl0sAPCEIPAX5vZsxQUh3V3jH8NypdHstmeJutXO/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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