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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd192b38b7005f93e8e5e75440f4b981d6c04d4ef1002d4092ce7cb1d257f0fa0' 
  AND token = 'GE4l21gk7cN12VihZiPlWnNanWRvv1Is2sRy+Ft2mjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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