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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b68f303325e16c6bc6f85235ada0235fb8a1d76c42877250ac7c21ecb6e0f2bf' 
  AND token = 'zUR2Gu3XM0t8z534M4vijGexdB8fjY3XvOH6Jjpv0RU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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