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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea4185d2c2a1ae1192544fc71995c0ca891e8a9d13f080836f6082600582b2f5' 
  AND token = 'iT/VjjPAu3GBU3a1p5WVZi+cbTnAw3u8KpiE7Ip26yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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