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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b54789117cf28470435aea8482c05b43e2bac83db134a463b644e99eb503e5b3' 
  AND token = 'XA2PEa1HoETk3Rr/CM/6SRyy10AU0mspP9Z9rzOTxvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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