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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f42041c237cb9f51d56893dfb9278c73f2cc8c6cb25c0c5fc44d9b35f0ff843' 
  AND token = 'MM8wFHc1Ah1RV7zgP7ieHfjmEH03UP6Qi/M1Hs6b18g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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