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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f6a2c97d041094e5513831fa9d7f88c73bce01bbe4661a1d5420b6243afe4bb' 
  AND token = '8H/3Z098fhXa2B82oLN2fKRk0YF8Szfke+1z3lQZ86I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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