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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20a032ce8659f58f1efafc076e4c5b7654fac4d18c0b4810c72d937400e4fb0f' 
  AND token = 'p+9zUBnA4LewxcO/DILMi7UkdP6d6IifFPzZSPwcEFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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