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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1926c5c37ec3266f3790c007c6c555c49b089b52054b012f6d81b0b037d4e26e' 
  AND token = 'LXHD4TyCqXiW5iw2nurfPpP9Wp/FO6+M6AB8S+crMl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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