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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fc7e76ddf80f9f2e141189f1c66d2b284f4b88c8630697e1b79d84484ec839c' 
  AND token = 'MW4FKXPTiMVWw1mQzK2HlO/bo9VRKKBn6MxzKIR4je4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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