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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '804b23b7f1d097facad3f9a1287e3146a838d399e66191ec823b3da2ab16b34b' 
  AND token = '7Jzwd02WlQTILlvGh6EP6pfQjx4DVZdROw9IYu3rSBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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