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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '294b56c184c1b6ce9b2b4c25a274503fd12f96a0993442e477fd8b0921fa8048' 
  AND token = 'xMaBefOBgZaVuRLsy2lRogl/ptjNcK6qk21dW3EcIXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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