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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47f1ed575bf4122da5247948cc0b46d292993be0f7db8a4282c85d945beb0fb4' 
  AND token = 'Le1sqEgFmg7uwnN5SLz/PdsXrps8xLisaN+FPo4WCG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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