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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03b86e9e31f1f32f56b0d302fb86ea6b47fecca3e59a5f56157ad4b34943c8d6' 
  AND token = 'wx04YS11YcQCVvSl2gpT8u803FXeVrXChTcYfzAJFlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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