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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8708a79be57eaca167251fd64067f08158e8b979334b522e2cc8461e1053d62' 
  AND token = 'mlECPBLONzwsbQdrtmPtmV9mrem8+o7C8okulhVI9HM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00100

JSON explain

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