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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5006a8fccf9c6d4daa7d11112076200d11f6b8ad3c7107e50ac8374460808ba4' 
  AND token = '0WcsERoiL3qcL7UDvlm+sTqeIOn/LsNFnOmTdwAgvRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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