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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df90b62b87f7e8dec24a0d7187cf83d0823e86c2b5d5bd60cf8f704a0533a774' 
  AND token = '34LDVXOONk1Cv4fV6ZIHz27fAOWqo4H9uNP6u5UW+mI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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