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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5801beacb86ea1a2e95227b5bd24cbae31843a2a35694a24f5babd0d8bfed578' 
  AND token = '8qk/oXJJiLHJzx3+XVicnJ+gbjpK5FzjOHGNkizxjwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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