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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68f1963281470a0aada2900b7e3362e16384d87370001319b6d3aa9a3832224b' 
  AND token = '7V5LbVUXAtx2CkdwA0jhJH+DQnL9Rz2M7oFEA6+Nb/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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