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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62089f2e8a19abb3d97bfc99118a6125aa9f4c8891b95c0e4ddb8f844bdc6968' 
  AND token = '6VYO8OX6E2F5RjGl6gvGSjAOtHdS2cXH4/E/kFvmPfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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