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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb0200e2e2a36616ae9a63425dd7b96f08c755c941ba7e470c5264b5bf94420f' 
  AND token = 'TC3SszkdboZUqD71NF8czGbmmSs3tRbjTWiyIFHmouk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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