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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90b76fbe5645aee24c523d207f6442656b48570cc20769e4bc7efe5602171b7c' 
  AND token = 'lrW5lAezEJ9M4F8/uwckz83dwqnWGelJCtip+kgJmUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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