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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7940dd0edb2e3f8a25a20e30418576497de2b905d4d3ade8f005757ed7c0a8b1' 
  AND token = 'OSTsMJTTZUrIfr5yz09SX8e8t0rek9rwhMG6NjtXkZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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