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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11d1d3ed69190d76704837cffad45d08bf364cf54168682b8db0b053ac9648f6' 
  AND token = 'Kp//PQu9BbF7ty3OxnVcjzGuw7wxsppUQX34bDTO9yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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