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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '245d7f60c279b5dbad32af4be9c1d85a92524d3ff3eb5046a0cc2d257480f9fe' 
  AND token = 'Od69acjl4zJJwzG/yi8rQlkiXYTnzpPCk5MMCwoXft8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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