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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62557eacc262a676f3054598f8da587ca01558e7e5a3b5cc41500195d6f19faa' 
  AND token = 'n6wf8y6IX0hyDA5GgQqFG6SIu/yFbYuS04KzHcAkAno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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