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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e6fbe13d96c9141175e585ae15a67bff5f9a624afeda529dfdec0c688a4689e' 
  AND token = 'F8CdKwyFKSxklkIvLt3nBqicegw9mhCirFKzIOmMwoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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