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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7884c91f5dee92dea7cddf971b32460b6c7ef9a1d678efc9442000f17438ee0e' 
  AND token = 'pSK6E8+IlONtAEZft05qmokijESPut2Z+PCMSQa3Tzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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