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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79316fe237da144423e2f3a9742837f322b65b768989365e058c4128ca616602' 
  AND token = '62tLQs72lA1+1pBhsv6mJRd1OqqeVaIaYGMDe+ekwpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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