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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd96475a04c8666a6bb8bd9045deb28a126818d31725a0e01a724c7b09cd355ab' 
  AND token = '07rAShEbs/7HpCqJbf0/zDeHQdaTEai+3uJUB4ZXU04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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