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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8ba5229b34fc77c33f2a385ae7fef4d638926f365465bb264958be7dc5b35a2' 
  AND token = 'uErUxqflUtj6IyKYlhjYDbgadUEPBQJa798EcvaZ5Hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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