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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23643aab910d2c1054400f9586e86e81ec9b203475854f3bbbb02c33f7751902' 
  AND token = 'cpWYUdPQWkn5VGm4/4eGI8qyDPswGVBc6cocInkDLh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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