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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f60c75a0baf7153ff3f1a4fd951f5a1c4c0642fbbe9ab75387628f20a183e2cc' 
  AND token = 'C3OXZqyGHt0MpKQ4qRWcwdYGNlQyYlz9zuXO3nsTEwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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