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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c6ed38c7dafc987f60d7283e4ffa71190ae18dc5e4e80821cddc4a2c3703429' 
  AND token = 'EMeqlFi5YFW4+ifHsAjerWK9xL5+6bugVOKnikJQHoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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