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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a68563dcadb5eccccd9b984b7aa24c08cf1097b7e2b5abe4fb8a8c651dae3b3' 
  AND token = 'FYMJ49RJdtUJPseMS2nfITm+1ug81WAvZtAIOllgoXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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