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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd551c1a0b8accd608842d9405dcfa524fb5457a0c88be87564e1b7d96473174' 
  AND token = '9qNtcawegjTWXTi1e7cVXllMZbx04OET3mHuyfo7C6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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