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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3e1a118fad77ae9b418dd7830399f27baafb04a39f19ade559fe1af7e04e9f0' 
  AND token = 'DzkGborF3lW//RuypATIg3RfIAEt0zfhaL0h80Nzktc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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