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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bb20102be49394b2f600f276390ed7d1dde990bebf4f2300e44d92730500224' 
  AND token = 'OPggk7dpfM6gxlP0TYhi2o4xzrg5PxCMXZak9zaZWuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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