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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '602588c5c3b28bac4be123b353b7cca322cdde77e786f4a67ad45c123ae6f222' 
  AND token = '4LJtJuPiTqlBR8GkE6J8n4NMnis55IsutQkRVMKk040=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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