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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ab121c5bb545f33ffa10c896912a67d3107e700cc320df044aa5a5b14b6e456' 
  AND token = 'SVy1hukypvHOovUQY3A63e2rcBX7ko50AFUsd4ukbvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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