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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4f4ac5e6b3977481169a7fdb9cc25c8113c917a3b53ee8f4b301abca81ceaf6' 
  AND token = 'TmHrgq4ihz6vmR3Pqp/IGg69EqsH85VtAYhiDpGEYAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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