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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb3d02628a963b2663e9412ec8948f0da9eef7044d91f9428a70c28da60bccdd' 
  AND token = '00CkJ9wGQm3Av9wNWyi72TW/I/Vtu1bDgifkBrn/7/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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