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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c61acd6217e9a6c7caf0e1cca99ff0381bc190554bb1e38147e1d1f0698d205' 
  AND token = '4CZAlB3qpqwEY5kquru3oQczvO91YjL+vu64Yyjc6+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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