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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7ddcf1febca21c0ad0e8db9066edebce804f67be8d63cadd0cfc7e5c91d9bac' 
  AND token = 'JKY/YuCgyjSVo4OZW8YX5a5XF6AIc6vHhqcrUUGYUm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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