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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7891f8b1ca3d91a472c4f56446754d5e7b7b434243a7d65a6e48c4955ede443e' 
  AND token = 'wx0SdqsyjKG4ZpgV/5zIjggrP9mWSakwKn/Xg4UMDNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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