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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffba2c69ec0373d19723bccfb410f42848f93a2e2e3102d591a67fbaac19f0d8' 
  AND token = 'iz8sI98b6skenYNc0t5lFKUJk32JNs81+8EZSVCEh1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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