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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cde6fef8d614ef8f92019d09d1fc508f4f1d7fc54d7355072fc29c5f887b7f3a' 
  AND token = '00GqjC8RSURLWVw21E2K9D2hINFYk6+w4HcYtPDFS1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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