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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ccb6e5e3077385a1d411a26d747b2c005ff1d7dd0db9394f7a222221043e08f' 
  AND token = '9RWnPmYGibPiUy6y4cf2iN6zYMl7tFygeoyGzZC8qLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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