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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db64b1f73b0d7ba5683fd9c1ca8ae2c0acd20d023358e7b3598fc9e27445a2d4' 
  AND token = 'FP8zfgB3jgAc0ac6C0Iz/wVG3rF2Wcjv89MagxpWa6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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