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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70c5dd6ee9727a553f67936bda60b304bb5045b05cb2c55ca895a3b24cee53be' 
  AND token = 'X3sTHaY/s9hC+5g3u7vkf/rPVyuATZS+B3RKOT/RJYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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