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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fa586f98b72a187e15a2f848bbe0b57cac1211fe547d562a36c7ed59e5c10a6' 
  AND token = '5WEEjWWheQnQlxjAkHJJn/zTCbAsoqmJacRu4RsckUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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