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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dea25de5f07fd0eee5dca547bcdc175541d99584b19fe46df7e43f9612ff534' 
  AND token = 'C+Jn7TGmXYmj1SMJurVAOn4QMe8Aw9HS+P+jvb6zimA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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