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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcd0325284be2c55d281c7a685edc16c7003ea75b9aaf10289344fb5ca43e2fc' 
  AND token = '5WTtP5OnuEaQ8usjOkbnMT6HAzrWfM8kPJ86rr7ezdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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